Periodicity of OJ287 in multisite multifrequency fast photometry?... Now you see it and now you don't

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

1

Scientific paper

We report the results of a multisite observing campaign of observations of OJ287 in the visible, near infrared and submillimetric in Winter 1989-90. Simultaneous UBVRIK and white light data were obtained with three telescopes in Tenerife and La Palma on three nights in December-January, supported by follow-up observations in January and March 1990. Each telescope used a different instrument and observing method to take photometry with a resolution from one to a few minutes. The results show widely differing behavior at different frequencies and on different nights, in particular, a number of high amplitude sinusoidal oscillations were seen on December 31 in K and in V, R & I, but were not seen in simultaneous U and B observations. Similar oscillations were also seen in K in mid-January. Periodicity searches of the data show that two characteristic periods are repeated in different data sets, with different instruments, at different frequencies and at different epochs, these being of approximately 23 and 44 minutes period respectively. Confirmatory submillimetric observations at 90GHz carried out in March 1990 also show both of these periods. However, these variations do not show the standard characteristics of a periodicity (e.g.: constant period and amplitude) and are not even always present in the light curve, even in our data. We suggest that talk of "periodic" behavior in this object is specious, at best there may be pseudo-periodicity similar to some classes of semi-regular variable stars. The fact that the light curves in different colors, even of similar wavelength such as B and V show considerable differences, indicates that at least a two-component model and probably one with three or more components is required. The variations show significant time delays of around one third of a period even between V and R.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Periodicity of OJ287 in multisite multifrequency fast photometry?... Now you see it and now you don't does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Periodicity of OJ287 in multisite multifrequency fast photometry?... Now you see it and now you don't, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Periodicity of OJ287 in multisite multifrequency fast photometry?... Now you see it and now you don't will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1110134

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.